PDF malware analysis — malicious · 0c5c321fe30d44a7

MALICIOUS

PDF

78.7 KB Created: 2021-07-13 15:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 96121b7db4a3f7273edd4a15c84c32dc SHA-1: 26cb0ab8ea3ebd2da9bcb0f4021cfb934410cd4f SHA-256: 0c5c321fe30d44a75e539594742efd5ecaf562c655e20d5d5b9349473223b5e8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to compromised websites or phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing content but containing embedded links.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://archism.ru/uplcv?utm_term=inalsa+microwave+oven+user+manual PDF link annotation
- https://sahyadrisevasanstha.in/userfiles/file/rodapumevikifugon.pdfIn PDF document text
- https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abc7290c9ca---67874240397.pdfIn PDF document text
- http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d6fa67e82---vatid.pdfIn PDF document text
- https://landbondcorten.com/attachment/file/b772f2dbb43d32eca2f5f4a6258ad9c6.pdfIn PDF document text
- http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/324109642a3cd02badd03b66bdf0b89c/59181239748.pdfIn PDF document text
- http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01ee20247---mofetatujasiranepizowas.pdfIn PDF document text
- http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160888c5bdaad9---27267922362.pdfIn PDF document text
- http://daindnc.com/fckeditor/userfiles/file/2907280295.pdfIn PDF document text
- http://aarogyamedico.com/userfiles/file/30391793293.pdfIn PDF document text
- https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/4181d2dca30f9f7092e1656d5bc945a6/dobapenizadamedazu.pdfIn PDF document text
- http://allasclub.com/campannas/file/87664530987.pdfIn PDF document text
- http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9633bd903---wogusomewew.pdfIn PDF document text
- http://trungtinjsc.vn/upload/FCK/file/54375925497.pdfIn PDF document text
- http://biosurfest.com/userfiles/files/tokoraxadurabaz.pdfIn PDF document text
- https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99c3c5fe5---79320479381.pdfIn PDF document text
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c033a1a2ea4---vegidizilurula.pdfIn PDF document text
- https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b6ea845d9---26171025134.pdfIn PDF document text
- http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de4f41b2725---19261525861.pdfIn PDF document text
- http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160bce0ae72aac---34615450032.pdfIn PDF document text
- http://savoie-outils-coupants.com/ckfinder/userfiles/files/50376260202.pdfIn PDF document text
- https://podereilmontaleo.it/writable/public/userfiles/file/87906962174.pdfIn PDF document text
- https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/45c999caeddf656ee31984b08dfeaff5/9012129606.pdfIn PDF document text
- https://kristinanamaste.eu/files/14995325694.pdfIn PDF document text
- https://mannerfeltdesignteam.se/ckfinder/userfiles/files/zuxuxojenexikebeputot.pdfIn PDF document text
- https://gegeny.hu/uploads/file/gilozixikibubegipunuxofuf.pdfIn PDF document text
- http://naturallabs.fr/userfiles/file/13701755476.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d0e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD0E0	10496 bytes
SHA-256: `9e5f0016fa8461ca24dfceb37b942156abbafa8b641c3ddb543814d123822b21`
`font_01_sfnt_off0000e8bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8BF	17068 bytes
SHA-256: `d1ed0b58a8c7c262a0b1b9b628ab6307403503e5c3bab91beaaf65ebdf8187c5`
`font_02_sfnt_off0001155d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1155D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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